Only re-deliver query results if results have changed

Code example probably will be best description here.

@Entity
class KAEntry(
    @Unique val key: String,
    val value: String,
    @Id var id: Long = 0
)

class MyApp : Application() { 
    private lateinit var subs1: DataSubscription
    private lateinit var subs2: DataSubscription
    private lateinit var boxStore: BoxStore
        private set
   
    override fun onCreate() {
        super.onCreate()
        boxStore = MyObjectBox.builder().name("main").androidContext(this).build()
        val box = boxStore.boxFor(KAEntry::class.java)
        box.removeAll() // just for reproducibility, to avoid "unique constraint violation" on second run of app

        subs1 = box.query().equal(KAEntry_.key, "key1")
            .build().subscribe().observer { v ->
                Log.i("MyApp", "triggered for key1" )
            }

        subs2 = box.query().equal(KAEntry_.key, "key2")
            .build().subscribe().observer { v ->
                Log.i("MyApp", "triggered for key2" )
            }

        box.put(KAEntry("key1","some value"))
    }
}

Problem is that even I've only put "key1" object and therefore only first query should trigger it's observer - both actually get triggered:

2021-04-05 14:22:53.263 25926-25962/com.acme I/MyApp: triggered for key1
2021-04-05 14:22:53.263 25926-25963/com.acme I/MyApp: triggered for key2

Either I don't understand something or this observer on query actually bugged.
I can see that triggering observer for only those objects that are changed and are in query result may have some performance impact. Though even in this case I would like to have some way of detecting that change was made to objects that query returns and not any object of this type.

Non viene indicato alcun file sorgente, test o punto di ingresso. Inizia riproducendo l’esempio Kotlin di sottoscrizione a una query, quindi segui l’implementazione del query observer e i relativi test, se presenti. Il lavoro è completato quando gli observer ricevono notifiche solo se cambiano i risultati delle loro query, oppure quando viene documentato il modo supportato per rilevare le modifiche rilevanti agli oggetti.